i have problems during boot with radeon module. black screen appears.
if i add "blacklist radeon" to blacklist.conf i can boot normally. but i need vgaswitcheroo which not avaliable without radeon module.
Laptop hp pavilion dv6-3125er video Radeon 5650 and intel
ubuntu 11.04

I should add that deactivating the dedicated gfx card will cause 'atombios stuck in loop..' errors when logging out/shutting down the system. As far as I can see, it does not damage anything, but it delays logout a bit. To make that go away, one must re-activate the dedicated card before logging out
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martoMay 6 '11 at 12:41

Thank you. This seems to resolve my blank screen issue as well under ubuntu natty on ThinkPad T400 (with Radeon Switchable Graphics). I also set the BIOS under ThinkPad to always use external graphics.
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AntonySep 4 '11 at 15:13

I wish I had a BIOS option. I dont understand why the manufacturers omit so many options
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martoSep 4 '11 at 15:56

oh as can see, you don't need radeon card, right? you're happy with integrated GPU?
if so, simply delete (with synaptics) xorg drivers for radeon (package names are like xorg-driver-ati and xorg-driver-radeon or something similar)
the problem is that those drivers somehow won't work properly with default kernel of ubuntu 11.04

i just did that. intel card works just as it used to. vga_switcheroo is in place. everything's good but you can't use radeon card, of course.